Aquatrax F-12 Very Hard to Start Problem - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
 
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post #1 of 10 (permalink) Old 12-13-2016, 03:56 AM Thread Starter
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Question Aquatrax F-12 Very Hard to Start Problem

Hi, I own an aquatrax f-12 and my problem is that every time I start the engine, it takes way too long to get it running. It keeps on cranking and cranking then eventually the battery dies. However, if I do manage to get it started, my jet-ski would run just fine. If I turn it off and start it again, the same thing happens all over again.

Any ideas or fixes would be greatly appreciated.
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post #2 of 10 (permalink) Old 12-13-2016, 05:52 AM
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Try changing the plugs.
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post #3 of 10 (permalink) Old 12-13-2016, 06:04 AM Thread Starter
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Tried That. The spark plugs are new but still same problem.
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post #4 of 10 (permalink) Old 12-13-2016, 06:31 AM
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Just fyi, don't crank the engine for more that 10 or 15 seconds, with at least 30-45 seconds cool down. Pwc starters cannot handle long cranking sessions.
Is it throwing any codes ?
Recheck the gap on the plugs. Pull one and lay it on the head, crank the engine over and check for a healthy blue spark. Check all the grounds, especially between the battery and engine, but find and check them all for cleanliness and tightness.
Check and make sure the air filter is clean.
Have you done a compression check ? have you had the fuel pressure checked ? How does it idle once it has started ? Any missing, sputtering, or surging ?
Check for any loose, bad, or leaking vacuum lines, or intake gaskets, and make sure the intake manifold bolts are not loose.
If all that is good, I would start thinking about clogged fuel injectors. You can take them out and have them pressure cleaned, and reinstall with new orings.
Could be the fuel filter is getting plugged, pump and/or regulator are failing, or just some water in the fuel. Might try some good water remover and get some Startron in the system. Put a small ( I think it's a 1oz bottle) in the tank, add a gallon or two of 92 octane, start the ski and run it on the hose for 30 seconds. Let the ski sit over night. Start it and run on the hose for 1 minute, and let it sit over night. Startron is a enzyme, and very effective cleaner and fuel treatment. Do not worry about over treating with it using the whole 1oz bottle. If your going to try it, use it first without any other treatments or additives.
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post #5 of 10 (permalink) Old 12-13-2016, 07:43 AM Thread Starter
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It isn't showing any codes. Have checked the battery, the spark plugs(good sparks) and the air filter, they are all good and clean. I haven't done a compression check, do you happen to know what is the required psi? When it does manage to start, it runs smoothly(from idle to top speed, no problem). Its only the getting it to start is the problem. Fuel filter is also clean. No clogs on the fuel pump and injectors.
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post #6 of 10 (permalink) Old 12-13-2016, 10:18 AM
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I'm thinking 170-180. All need to be within 10% of each other.
I'm assuming that it is not the f12x turbo.
Get a test light and check to make sure the injectors are getting pulsed correctly at cranking speed.
If spark is good, injectors are getting pulsed, timing is good, fuel delivery and pressure are good, we are down to a bad sensor or ecu, vacuum leak, or valve train is out of adjustment. Have you heard any excess noise coming from the valve cover ?
What year is the ski ?
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post #7 of 10 (permalink) Old 12-13-2016, 10:30 AM
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If you can touch any vacuum line and get black on you hands or fingers from it, it is bad and could be leaking or collapsing, and needs to be replaced.
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post #8 of 10 (permalink) Old 12-13-2016, 06:59 PM Thread Starter
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I'm sorry, my bad, I didn't put an X after F-12. Was quite shock after reading the psi is around 170-180. its a 2004 year model and the one with the turbo in it. No excess noise coming from the valve cover either. if its an ecu problem shouldn't it not throw an error code? I'll check the vacuum later and would get back to you on that. Thanks.
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post #9 of 10 (permalink) Old 12-13-2016, 07:41 PM
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That's just what I have read, but might have been referenced to a f12 and not a f12x.
A bad ecu will not necessarily throw a code. A bad component will cause the ecu to throw a code (should).
Not sure why Honda is using a manual and electronic idle control, unless the manual is for setting a base idle. It is possible that the IAC on top of the throttle body has gone out, or that the throttle body is extremely dirty. To my knowledge, there really isn't any way of thoroughly testing the IAC, and they don't always throw a code when bad, they just make things difficult. Come to think of it, this symptom is starting to sound familiar in my brain, and makes sense.
You might look into a new Idle Air Control valve.
When your riding, and come off the throttle quickly, does it seem that it wants to poss. die?
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post #10 of 10 (permalink) Old 12-13-2016, 07:45 PM
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New ones are pretty high, but there a few used ones on ebay.
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